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tac-a Cerca RlCHARD M. HOE AND STEPHEN D. TUCKER, OF NEW YZRK, N. Y.

Letters Patent N 92,050, dated June 29, 1869.

INIPROVEMENT. IN' PRINTING-PRESSES.

The Schedule referred to in these Letters Patent and making part cf thesame.

Figures 3 and 4 represent our machine as constructed with threecylinders in cach series, the operatlon'of which will beA fully setforth hereafter.

- Similar letters of reference indicate like parts in the v severaldrawings.

Our invention consistsf First, in so arranging and combining with eachother, two series of alternatingforl n-cylinders andimpressioncylinde1's,\vith the necessary inking-inachinery, that anydescribed number of rollsof paper or vsuccession of separate sheets maybe printed ou both sides in passing once through the machine;

Second, iu applying to the impression-cylinders a travelling-blanket, inthe form of an endless web or apron, instead of applying it to thesurface of the cylindex' as heretofore, whereby a greater surface ofblanket can be employed, so that the L set-off from the printed side ofthe paper, being distributed over this larger surface of blanket, willconsume a correspondingly longer time before it can become sufficient toreact injuriously on the paper;

Third, in so arranging the travelling-blanket that it willaid insustaining the paper as it passes from .one

- series of cylinders to the other;

Fourth, in combining the travelling-blankets with a series of form andimpression-cylimlers; and

Fifth, in mechanism for sustaining the cylinders, whereby they can beeasily and quickly removed and replaced, when it is required to changethe form or blanket, or for any other purpose.,

To enable others skilled in the art to make and use our invention, wewill describe the construction and operation ofthe same.

A represents the'frame-work of the machine, so constructed as toproperly hold and support the various operative parts.

In the sides of this frame are arranged suitable bearings m m, for thejournals n a of-the impression-*cylinders B B* and thrill-cylinders O C.llthe cylinders of each series are connected together by gear-wheels tIi i,

secured on their journals, through theA medium of which the propermovements are communicated to each cylinder.

On the 'ends of the journals of the cylinders Bl Cl are secured twobevel-gears H H, which are driven by the pinions I I on the shaft a,through which the necessary power is applied to operate the machine.

The form-cylinders C C* Gl are provided with the necessaryhiking-apparatus g gh h, and the impres-V sion-cylinders B Bx B2 arefurnished with travellingblankets J J. Y

These blankets are made in the form of an endless band, of the sainewidth as the cylinders around which they pass, and are held in properposition by the rollers b b b, which, furnished with adjustable bearingsjj, hold the blankets at all times at the proper tension, and supportthe paper in its passage to the nest pair of cylinders. f

Suitable bearings or supports for the rolls of paper, D D* D, arearranged upon the franieand proper mechanism, of a forni similar to thatnow in use in printing-machines, is attached to and combined' with themachine for each roll of paper, when rolls are used, for separating thesheets from the rolls as they are printed.

The machine being provided with the necessary attachmentsofsheet-tliers, receiving-tables, inking-apparatus, Svc., connection ismade with the driving-power, and the operation proceeds as follows:

The sheet d tiom the tirst roll passes around the impression-cylinder B,and receives an impression on its undersurlace from the form-cylinderC'. The sheet then y.

passes through tothe opposite set of cylinders, and receives thesecondimpressiou on its upper surface from the form-cylinder C.

Tle second sheet d* at the same time receives an lmpression on its undersurface from the form-cylinder (y, and on its upper. surface from theform-cylinder O, from which the under surface of the iirst sheet d isalso printed.

Simultaneously with these operations, the third sheet d is printed .onits under surface from the form-cylinder (J, and on its upper surfacefrom the form-cylinder The printed sheets, vafter being separated fromthe rolls by the cutting-mechanism, are laid upon the receiving-table bythe sheet-fliers. A

By the arrangement of the cylinders it will be seen that theform-cylindersGl G2 print the opposite sides of the separate sheets atthe same time, and that the cylinders Bz perform the office ofimpression-cylinders for the form-cylinders O C* (ll-C3.

1t will also be evident, that by an addition of anotherimpressiou-cylinder to the form-cylinder C, and of anotherforni-cylinder toy the impression-cylinder B3, a fourth roll of papermay be printed upon, and so on ad I'bitam. v

i The cylinders from which two sheets are imprinted at the same time,are necessarily furnished with a. second set of inking-rollers, h h.

When it becomes necessary to change the blankets, the side of the framelis removed, and the `bar k placed in position, as shown in fig. 1. Thecylinder, with its journal-box m, is drawn out of the frame onto the bark, and the blanket drawn from the cylinder over the end, and laidiufolds ou the bar, between it and the end ofthe journal n. The rod o isthen attached to the end of the journal, and the cylinder is raised fromthe bar, by means of the nu't on the end of the rod o, sufficiently toallow of the bar being removed, so that bylifting one end ofthe roller bfrom its bearing, the blanket is drawn from the roller, and quicklyremoved ii'o'm the machine.

By proceeding with the operation in a reverse mauner, a new blanket maybe easily aud expeditiously placed iulposition on the cylinder.

' In constructing a machine with our improvements, we prefer to use thearrangement, represented in figs. 3 and 4, of three cylinders in eachseries, the left-hand series containing two form-cylinders C C2 and oneimpression-cylinder B', and the right-hand, one formcyliiider C and twoimpression-cyliiiders B` B2.

By this arrangement the stereotype-forms, containing the principal partofthe matter composing the paper, may be arranged upon thetorni-cylinders G C, from vwhich one side of each sheet is printed,while the forms for the other side maybe kept open as long as possible,in order to get in the latest news, such being the custom in allnewspaper-printing offices; andas it is very important to get to presswith the least delay possible, itwill be readily seen that less timewill be cousumed in taking one stereotype, and using one form tpriut'the other side of each sheet, than more.

Having thus fully described our invention, \Vhat we claim, and desire tosecure by Letters Pat ents l. The combinationand arrangement in armtinffsion-cylinders, as shown, whereby the same are iliade to performthe twofold duty of blankets and sheet-con.- veyers, 'thus dispensingentirely with the use of tapes for con veyiug the sheets, substantiallyas described and` specified.

3. The mechanism for sustaining the cylinder for changing the form orblanket, consisting of the rod o vand bar la, substantially asdescribed.

RICHD. M. HOE. STEPHEN I). TUCKER. lVitnesses to signature of R. M. HOE:

.THOMAS G. OONNOLLY,

H. GARRETT. Witnesses to signature of S. D. TUCKER:

C. A. DURGIN, EDWARD E. OsonN.

